I've been doing this in client side Javascript for the last year or so. Rather than having 20 lines of nested jQuery callbacks on a page, I make each callback a function and group the event bindings together:

e.g.:

    var showPreview = function() { ... };
    var calculate = function() { ... };
    $('a.preview').click(showPreview);
    $('a.calculate').click(calculate);

Even nicer is to split this out into a separate CoffeeScript file. Then just call `new SuperAwesomeCalculator()` on the page.

I think what made me do this was Erlang. After a point it gets annoying to type NewNewNewNewNewParams, so it's easier just to split it out into a separate function :)